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首页> 外文期刊>Aquatic Sciences >Photosynthetic pigment changes and adaptations in biofilms in response to flow intermittency
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Photosynthetic pigment changes and adaptations in biofilms in response to flow intermittency

机译：光合色素的变化和适应于生物膜中的流动间歇性

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摘要

Among the environmental factors affecting benthic algae and cyanobacteria in streams, the one often producing the largest effects is flow intermittency. This study aimed to characterize the responses of algal assemblages to flow intermittency in a Mediterranean intermittent stream during the drying, non-flow (112 days), and rewetting phases. Algae growing in the epilithic, epipsammic and hyporheic streambed compartments were analyzed for pigment composition, and for the existence of structural changes in cells. Chlorophyll-a concentrations decreased between 60 to 90 % during the non-flow phase, indicating low resistance of algal assemblages to desiccation. In contrast, fast recoveries of Chlorophyll-a when flow resumed indicated high resilience. Pigment composition revealed that the epilithic algal assemblage was considerably different than the epipsammic and hyporheic ones. These differences were mainly attributed to the physical conditions prevailing on each streambed compartment that allowed the growth of different algal assemblages. During the non-flow phase, the synthesis of protective carotenoids (i.e. echinenone and scytonemin) and the occurrence of cell resistance structures (i.e. enlarged membrane thickness and resistant spores) enhanced resistance of the epilithic biofilm. The resistance observed in the epilithic biofilm might also be related to the tightly adhered growth-form of algae on this substratum. Main results suggest that algal assemblages in the epilithic compartment, which were the most exposed to desiccation, were structurally and functionally better adapted to flow interruption than those colonizing other streambed compartments, and that this compartment plays a crucial role in maintaining ecosystem functions under varying flow periods.
机译：在影响溪流中底栖藻类和蓝细菌的环境因素中，经常产生最大影响的因素是流量间歇性。这项研究旨在表征在干燥，不流动（112天）和重新润湿阶段，藻类组合对地中海间歇性河流中流动间歇性的响应。分析了生长在上石板，癫痫病和流泪性隔室中的藻类的色素成分以及细胞中结构变化的存在。在非流动阶段，叶绿素-a的浓度降低了60％至90％，这表明藻类组合物对干燥的抵抗力较低。相反，恢复流动后叶绿素-a的快速恢复表明其高回弹力。颜料成分显示，上石藻群与上表层和流变型藻的组合明显不同。这些差异主要归因于每个流化室普遍存在的物理条件，这些条件允许不同藻类组合的生长。在非流动阶段，保护性类胡萝卜素（即海胆烯酮和胞嘧啶）的合成以及细胞抗性结构（即膜厚度增加和抗性孢子）的出现增强了表石生物膜的抗性。在上层生物膜中观察到的抗性也可能与藻类在该基质上紧密附着的生长形式有关。主要结果表明，比起其他流化隔室，那些最易遭受干燥的上石器隔室中的藻类组合在结构和功能上更能适应流动中断，并且该隔室在维持不同流量下的生态系统功能方面起着至关重要的作用。期。

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  • 来源
    《Aquatic Sciences》 |2014年第4期|565-578|共14页
  • 作者

    Xisca Timoner; Teresa Buchaca; Vicenc Acuna; Sergi Sabater;

  • 作者单位

    Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain,Institute of Aquatic Ecology, University of Girona, Campus Montilivi, 17071 Girona, Spain;

    Centre for Advanced Studies of Blanes, CEAB-CSIC, Acces a la Cala St. Francesc 14, 17300 Blanes, Spain;

    Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain;

    Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain,Institute of Aquatic Ecology, University of Girona, Campus Montilivi, 17071 Girona, Spain;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Algae; Cyanobacteria; Pigments; Desiccation; Intermittency; Climate change;

    机译：藻类;蓝细菌;颜料;干燥;间歇性气候变化;

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